Optionals IAS Mains Physics: Questions 40 - 46 of 307

• Meissner and Ochsenfeld discovered that a superconductor expelled the magnetic flux as the former was cooled below in an external magnetic field i.e.. it behaved as a perfect diamagnet. This phenomenon is known as the Meissner effect. Such a flux exclusion is also observed if the superconductor is first cooled below and then placed in the magneti…

• For the velocity distribution of molecules in a gas, we must choose a given direction and see how many molecules have particular components of velocity along it. We define the velocity distribution as the fraction of molecules with velocities, say the x direction b/w is . The velocity distribution function is proportional to the Boltzmann factor, …

For the previous problem, let as find

where As the given wave function is normalized

• Let two capillaries A and B, of lengths and radii respectively be connected in series, as shown in figure and let a liquid of coefficient of viscosity flow through them in steady or streamline motion. Then, since two liquids are incompressible, the same volume of liquid that passes through capillary A, in a given time also passes through capilla…

• Meter.

  Angular frequency

  Frequency

  m/s

  Gives the direction of propagation.

• As we have so is the direction of propagation.

  = resultant of two waves.

  … eq. (1)

  … eq. (2)

• From equation (1) and (2)

• Phase of resultant wave

  Resultant amplitude.